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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE RIPE ELBE TAME 1,2-DCA Methanol Number Sampled (pg/L) (411L) (pg1L) (pg/L) (pglL) (pg1L) (pg1L) (pg1L) Comments VW-7 12/10/2003 <500 <100 91 <5 0 <50 <5 0 160 <100 03/08/2004 <500 <100 63 <5 0 <50 <5 0 64 <100 06124004 <100 <20 1 1 <0 50 <0 50 <0 50 16 <100 09/20/2004 <100 <20 12 <10 <10 <10 20 -- 12120/2004 <100 100 13 <1 0 <1 0 <1 0 210J — VW-8 12/19/2002 NA <10 <10 <10 <10 <10 -- — 03/06/2003 <500 <20 10 <2 5 <2 5 <2 5 60 06/1112003 <500 <100 <2 5 <5 0 <5 0 <5 0 — — 09/24/2003 <1,000 <200 <5 0 <10 <10 <10 — — 12/10/2003 <100 <20 49 <1 0 <1 0 <1 0 19 <100 03/08/2004 <500 <100 <2 5 <5 0 <5 0 <50 <2 5 <200 06/24/2004 <500 <100 28 <2 5 <2 5 <25 300 <100 09/20/2004 <10,000 <2 000 <50 <100 <100 <100 <50 — 1212112004 <1,000 <200 <5 0 <10 <10 <10 50 — VW-9 03/06/2003 — — -- — -- -- -- "- 12/10/2003 — — — — — — — — Well Dry 03108112004 — — — — — — -- Well Dry 06/23/2004 — — — -- — — -- — Well Dry,Not Sampled 09/20/2004 — -- — — — — — — Well Dry,Not Sampled Not Sampled,Well Dry VW-10 12/19/2002 NA <100 <10 <10 <10 <10 — — 03/06/2003 <10,000 <2,000 <50 <50 <50 <50 <50 - 06/11/2003 <5 000 <1 000 <25 <50 <50 <50 — - 09/24/2003 <1,000 <200 <5 0 <10 <10 <10 — -- 12/10/2003 <1,000 <200 <5 0 <10 <10 <10 97 <100 03/08/2004 <500 <100 <2 5 <5 0 <5 0 <50 <2 5 <100 06124!2004 <500 <100 28 1 <2 5 <2 5 1 <2 5 290 <100 09/20/2004 <500 <100 <2 5 <5 0 <50 <5 0 <2 5 -- 12/21/2004 <10,000 UJ <2,000 UJ <50 UJ <100 UJ <100 UJ <100 UJ <50 UJ — VW-11 12/19/2002 NA <5 0 098 <0 50 <0 50 <0 50 — -- 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 27 — 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 — — Report Date January 31, 2005 Page 11 of 13